import CryptoJS from "crypto-js";

// 对称加密
export default {
  //随机生成指定数量的16进制key
  generatekey(num) {
    let library =
      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    let key = "";
    for (var i = 0; i < num; i++) {
      let randomPoz = Math.floor(Math.random() * library.length);
      key += library.substring(randomPoz, randomPoz + 1);
    }
    return key;
  },

  //加密
  encrypt(word, keyStr) {
    keyStr = keyStr ? keyStr : "drxfdsjcomwssdbc"; //判断是否存在ksy，不存在就用定义好的key
    var key = CryptoJS.enc.Utf8.parse(keyStr);
    var srcs = CryptoJS.enc.Utf8.parse(word);
    var encrypted = CryptoJS.AES.encrypt(srcs, key, {
      mode: CryptoJS.mode.ECB,
      padding: CryptoJS.pad.Pkcs7
    });
    return encrypted.toString();
  },
  //解密
  decrypt(word, keyStr) {
    keyStr = keyStr ? keyStr : "drxfdsjcomwssdbc";
    var key = CryptoJS.enc.Utf8.parse(keyStr);
    var decrypt = CryptoJS.AES.decrypt(word, key, {
      mode: CryptoJS.mode.ECB,
      padding: CryptoJS.pad.Pkcs7
    });
    return CryptoJS.enc.Utf8.stringify(decrypt).toString();
  },
  //DES解密
  /*
  * message:需要解密的字符串，
  * key： 密钥（加密解密密钥同一个）
  */
  decryptDes(message, key = 'drxfdsjcomwssdbc') {
      let keyHex = CryptoJS.enc.Utf8.parse(key)
      let decrypted = CryptoJS.DES.decrypt(
        {
          ciphertext: CryptoJS.enc.Hex.parse(message)
        },// 若message是base64格式，则无需转16进制hex，直接传入message即可
        keyHex,
        {
          mode: CryptoJS.mode.ECB,
          padding: CryptoJS.pad.Pkcs7
        }
      )
      return decrypted.toString(CryptoJS.enc.Utf8)
    }
};
